Improvement in the manufacture of artificial stone



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106. COMPOSITIONS, COATING 0R PLASTICJ suaanrurao Foe MISSING com fier UNITED STATES PATENT OEEIo JULIUs FREDERICK HOFFMANN, OF CHICAGO, ILLINOIS.

IMPROVEMENT IN THE MANUFACTUREYOF ARTIFICIAL STONE.

Specification forming part of Letters Patent No. 131,348, dated September 17, 1872. i

To all whom it may concern:

Be it known that I, JULIUS FREDERICK H OFFMANN, of Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in the Manufacture of Artificial Stone; and I do declare that the following is a true and accurate description Paris and ten (10) pounds of powdereddiurn L ora This I mix thoroughly, stamp and pound it into molds, which give it the desired form, and after rem oving the thus-formed artificial stone from the mold I leave the same exposed to the atmos here for from threat-9,,- six days, according to 15s capacity; and during this time I sprinkle it over with water frequently, alter wliw'fitf 's're' a'd i' forilse.

Ican give to my artificial stone any desired color by adding to the above-specified mixture more or less of red, blue, yellow, or black color, and'thus can give it the appearance of any kind of natural stone.

The artificial stone made by this process has a clean and smooth appearance, regularity of color, and will resist the changes of the weather better than any artificial stone heretofore made.

What I claim as my invention, and desire to secure by Letters Patent, is-

The manufacture of artificial stone of the ingredients and in the manner herein described.v

JULIUS FREDERICK HOFFMANN.

Witnesses:

WM. H. Lo'rz, THEO. KARLS. 

